/ Dictionary / Index C Clactonian: Meaning and Definition of Find definitions for: Clac•to•ni•an Pronunciation: (klak-tō'nē-un), [key] — adj. of, pertaining to, or characteristic of a Lower Paleolithic culture in England marked by the production of tools made from stone flakes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. clack valve clad Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language